Telephone-circuit signaling apparatus.



No. 833.816. "PATENTED 0GT.3,1906.

J. G. WRAY, H. T. GARDNER & w. e. KINTON.

TELEPHONE CIRCUIT SIGNALING APPARATUS. APPLICATION nun mum-1905.

a SERIES-SHEET 1.- I

' ATTORNEY.

P TENTED 0011:. 23,1906. J. G. WRAY, H. T. GARDNER a; W. G. 'KINTON.' TELEPHONE CIRCUIT SIGNALING APPARATUS.

APPLICATION FILED JULY 3. 1905.

'3 SHEETS-SHEET 2.

A RNEY No' 833,816. PATENTED OCT. 23, 1906. J. G. 'WRAY, H. T. GARDNER &,w. G. KINTON. TELEPHONE CIRCUIT SIGNALING APPARATUS.

'APPLIOATI ON FILED JULY 3. 1905.

s SHEETS-SHBET s. A

"'AT ORA EK Improvements in Telephone-.(Jircuit Signal-- ing four-party lines, the arrangement being To aZZ whom it may-concern- UNITED, sj'ra rns PATENT OFFICE. 1 j

'AMEs G. WR'AY, on CHICAGO;- HERBERT QGARDNER, QFMAYWOQD, AND WILLIAM G..-KINTQN,.0FCHICAGO, ILLINOIS, ASSIGNORS'TO AMERICAN-TELEPHONE AND TELEGRAPH COMPANY, A, CORPORATION I OF NEW'YORK.-.

TELEPHONE-CIRCUIT SIGNALING APPARATUS.

, No; 833,816. I

Be-it' known that we, JAMES GJWRAY, residing at Chicago, HERBEnT 'l. GARDNER, residing at Maywood, and WILLIAM G. KINTON,

residing at Chicago, 'in' the countyof Cook and State of Illinois, have invented certain ing Apparatus, of which the following is 'a specification. I i I .The present'invention relates to-a telehoneexchange system, and is mainly em..

odied in novel means for selectively signalsuch that one and-two party lines can be properly signaled by'the same apparatus, there being no ringing-key employed in any case." Y

The invention isshown as embodied in a trunk-line system in which atrunk-line cordcircuit is employed in signaling a subscriber who has been called for by another central ofiice, the system being such that the use of a ringing-key is obviated, the insertion of the plug causing the signal toloperate, while the operator at the central oilic e is protected from accidental shock, since the current from ithe ringinggenerator cannot enter the plug until the latter has been fully inserted in the jack; The arrangement is such, further more, that it is'impossible to signal a wanted subscriber unless the connection has been made, so thatf'alse or premature signals .can-

. stations depends upon theLoperation of three not be given, it being impossible, for ex ample, to signal a subscriber if a mistake has. been-made In the selection of the trunk con- -'nectIo'n. j in the case of a-fourparty hne the control of the signals'at the severalsubkeys, which may be termoi fnIaster-keys, since. each key may be associated with, and

thereby rendered: capable of controlling,the

opcrationoi all'the trunk cord-circuits under the control of the operator at'the called ccntral station. A'singleparty line'inay be sig- 5' o controlled by the "useoi asingle master-key,

-naled without the operation-of the kcys,-and

oneoi .the substations on afo'ur-party line Specification of Letters Patent. Applicationfiled July 3,1905. Serial In. 268.215.

:a diagram similar if desired, or the system may be employed in connection with. two or four party lines hav-' ing multiple jacks corresponding to the substations on the line, in which case no manipulation of the keys is necessary, except in COD.- nection with the stations on a four-party quired. The four-party lines are provided in the usual way with two signals in circuits branched to ground from one side of the line and adapted to respond, respectively, to cur- Patented. Oct. 23, 190 i line, in which case one master-key only'i's rerents flowing in opposite directions andtwo signals branched from the oppositeside of the'line also having this characteristic difference.

' In accordance with the invention the side: v0f the line to which the generatoris connected and the direction in which the current flows from the generator are selected by the action ofrelays, the o eration of which. is influenced by the inastereys above mentioned, the arrangement being such that the key 'used must; be manipulated prior to the insertion of the plug in the jack in order to insure the giving of the proper signal, 1

' Figure 1 isa c iagram of the circuits at a I calling central oilicethat is to say, a central ollice where the calling-subsCribers line is' connected. Fig. 2 is a diagram'of circuits at the called central oi'hce that is to say, a central o'llice connected by a trunk-lino with the calling central ollice, Fig. 2 -also showing diagrams of one, two, and four party lines'to 1 which connection can be made; and Fig, 3 is to Fig. .2, but showi-nga' modification.

- The salient features of the invention are .mainly illustrated in Figs. 2 and '3; but some of the circuits which require mention extend through bothcentral stations, and in tracing such circuits it is to be understood that the. by the reference characters a and a in Fig; 2 are continuations of the conductors designated by'the conductors illustrated same reference characters in Fig. 1,"the

same being true in. both figures of the con ductorsdesighatedby the characters band b.

The apparatus atthe calling central station is substantially thesame asthatusually employed, it being-understood, therefore,

that if a subscriber-+for example, atstation 40()has notified the'opera-tor at central station M, Fig. 1, that he desires, for example, station 500, which is connected with central station N, the operator at station M, calling over the line a a notifies the operator at station N that station 500 is Wanted and asks to have a. trunleline assigned to make the necessary connections. Assuming, then, that the trunk-line assigned is the line 1) b the operator at stetionM inserts the plug A.-

Winding ol imluction-coil I to conductor 3;, which leads to the tip-terminal A of the jack A thence to the tip A? ofthe plug J conductor 3 at station M to ground G, and thence back to ground G at station N, completin t e circuit. This (:zt'LlsQs the attraction oi the armetures and d of the relay (1, and it may be assumed, therefore, thut these arnnttures are in engagement with their forward contacts in tracing the signaling-(in cuits to be hereinafter described.

In signaling a substation on a one-party line-tor example, the substation ()()---there is no noveltyinvolved; hut the operation of sending the signal may be briefly described in order to facilitate the understanding of the novel. features of the invention, which relate mainly to the selective signaling of the four-party lines. The insertion of the lug (l into the ack (W of the hne which ends to substation 500 completes :t signaling-circuit from the generator (5, which nnty v be treced as follows: The generator e IS arranged to produce a nilsnting current. Starting with the brush c current flows through conductor 4 to armature h of relay h, conductor 5, main coil 2' of relay i, conductor 3, armature ll of relay 7t, back'contect of said armature to conductor 7, zrrn'iature d conductor 8, armature if, of relay 1', (mm doctor 9, struntture 9" of relay 9, conductor 30, armature of relay}, to the ring contuct-piece (3* ol' plug (.7, long s )ring (3 of the jack and thus out over the line through the condenser and bell 2 and back to the short spring and tip (7, conductor 12, strum/tore of relay], conductor 13,:trmntore g of relay- 1, conductor 14, Winding 51 of iiuluction-coil I, conduetors l5, l6, and l"! to tl brush :1 oi the generator e. The

completion of this circuit depends upon the.

energizelion oi the relays 1 and f, the former being controlled, 51S previously stated, from the central station M, While the letter is controlled from the central station N, the closure of the usual local grounded frame-circuit of the plug C and jock )ermitting currcm to .ilow from the battery I through the relay fend the supplemental windings gr, l1, and i of the relays g, h, ltIMl i, these windings being so ndjusted'as to develop only sullicicnt magnetism to nntintein in their forward positions the itTITlilllIQS ofthe relays when thus attract ed, but not suilicient to cause said urmnturcs to be attracted, so that upon the lirst inscrtion of theplug U therelsty y" lonc opcrolcs. Assuming, therefore, that the hell at station 500 arranged to operate in response to puleating" currents traveling in the direction. traced the hell will be rung upon thc inscrtlon of the plug (,7 in the juck C if the o1 hcr end of the trunk-line has been properly connected at station M. The si nal is sloppcd by the operation olthe relax} t, the main coil "L of whichis in the g uic1fntor-circuil and soadjusted as to create sullicicnl magnetism to attract the armature i when lhc receiver at the called station hns been tultcn down, thorcby closing tlu circuit conductively :tlHl shunting the condenser and bell.

in the construction hcrcin shown the twopurty line, which isindicnlcd us having the stations :Sdl and. 502 located thereon, is provided with multiple jocks, the long and short springs of which are rcverscihso that the two bells 2 2, branched to ground from opposilesides of the line,'cmi be selectively rung by current flowing in the.snme" lircction from the generator, one termimil oi suid generator being grounded at (P, Fig. 1, it being deemed unnecessary to trace the circuits, since this arrangement possesses no features of novelty so in us relates to the P esent invention. The construction under consideration, moreover, is fully set forth 'end described innmother application liled by us of even date herewith, Serial No. 268,216.

in the case of a four-party line one jack only is employed for each lme in thc construction shownin Fig. .2, the sclcction ol' the stations depending upon the use of three master-keys s, t, and 11,. thcrc being one station on the line, (shown as station No. 503,: which has its jock urrongcd lilac that of stution No. 500 one onc-purty line and also like the jack C of station 501 of the two-party line, and which, lhorclorc, can be signaled without the use of any kcy -thzit is to saiy,

' merely by the/insertion of the plug G into the jack C-"". The bell at station No. 503 is branched to ground from the some side of the linens the bell at station 50] mid the jack C is arranged to correspond to the jack for st:i tion 501, so thnlflho operation is the some in coimcction with both of thes substations.

The other thrcc substations, howeverull.

tion oi the rchtys g and 71, the bitter consti-- toting subs-tum inlly :tn elcctromagnetic polechanging switch. 'to control the directiou'o'f eurrent,iwhile the former constitutes means for changing the connections between tho brushes of the generator and the conductors of the line, so that itis possible by the operation of these relays to shift the line connections and theklirection of the current, and

thereby Select the desired signal out of the three signals at the stations 504, 505, and

It may be stated at thispoint that qvhile the two-party line has been shown as jack may be emplo by the master-key s equipped with jacks corresponding in numher to the substations on the line a single ed, as inthe case of the four-party line, an the signaling controlled or the master-key t, as will readily. appear scription' of the'ineans for'signaling on the four-party line shown.

It is to be understood that the keys 8,1,

' and at are connected in multiple jto'all'the trunk line cord; sets under the control of the operatoratcentral stationNor to all of, a

respond to positive currents and which is .40

y of the jack thereby closing a circuit,

themain coilductors 19 and 20., ar'r'naturef of relayfa'nd, f conductors 2-1, 2 2,and l back to the bat-' fore, the relay '9 manipulation of of, th

. which each relay 35 group of any preferred number and that they control only local circuits which influence the relays g and.-h,-it being necessary, therefore,

that the right ke be manipulated prior to the insertion of t the key causes the member tracted, the said in its attracted position after the key has been released by the supplemental .coil with mental coils being supplied with current in response to the insertion of the plu' i Assuming that station 1504 is to e called, this station having a bell which is adapted to branched toiyground from the conductors, which is connected with the short spring C the plug in the jack manipulates the; key 8, traced asfollows: Starting from the battery Bthe current flows tliroughconductors 15 I6 17, key member s", conductors 18, 19, and20, g of relay 9 being between con;-

tery B. By manipulatingthe key a, therecientextent to attract its-armatures g and g prior to the insertion of the plug (J, these armatures being maintained attracted by current flowing through the supplemental coil g, which is in series with thecoil'ol' the relay f after the plug has lweninsorted'. The

key 8 may then be released.-;--i. (1., after the plug, has been inserted-tho o rangenient of the signaling-circuit having thus, been provided for. tlln this case the uit from the positive brush c of the generatore through the .conductor'A, armature In, confrom the following. de-.

e plug in the jack. The

e relay controlled thereby tobe at-. armature being maintained is provided, these supple-v theoperator before inserting which may be becomes energized ton sulii cccssury a1 may be traced, as before,

operation of any ofthe ductorn, coil i" of relay i, conductor (i,ar1'nature l2, conductor 7, armatured, conductor 8," armature '1",conductoni, conductor 9", armature g, conductor 13,'armature of re- .layf, and conductor 12 to theplugtip C,

which is in connection through the short which the-si nal 2" at station 504 is branched 4 h spring C with the conductor S, from, I

to ground, the connectioubeing completed through ground G and conductors 16 and. 17 to the brush a of the generator 3. The s gnal at substation 504 will therefore be operated by positive current pulsations without the other signals upon this line or substation'circui't.

The signal at substation 505 is branched to ground from the conductorl, which is connected: with the long s ring, C of the spring-jack C so as to e connected when t 1c plug C is in the jack with.the'ring'ter minal- (T thereof. This. signal is arranged to respond to currents'l'lowing in the-direction causes the armatures h? 'ma'i'n 1n engagement will travel by way conductor 7, armature d ductor 8, armature-2 ground from-the opposite tolthat of those previously -d e-' scribed and is controlled by the key i, which in turn controls" a local circuit containing a relay which constitutes of relay 7L,

traced as-follows: Starting with the nega- 4 five bruslre' of the generator e,.the current h of relay.ln-"honductor 6, the main coil'i o'f relay 'i, conductor 5, armature 7L2 of relay h,

of pelay (Z, conconductor 9, armature g cond to'the. ring-contact (i of the plug (hand thus to the long jack-spring (W which is attached to linb-co'mlnctt)r 505 througlnthc hell 2 to ground, returning through the earth to the the central-station call-generator; It will be seen, therci'ore, that the negative current pulsations from the generator 0"" through the signal atstation 505 in the proper direct on to cause thesaid signal to operate. In order to operate the. signal at, substa-' tion 506, which is arrangcdto operate also current flowing in the samejdircction'asthat 'l and. at station oi conductor 26,.anmature I uctor 1t), and armature of the relay 1 grounded pole of.

will llow in response to a negative'currcnt that is, a

required to operate the signal at station 505, i i

the signal,. l-io wever, bein-,, g branched to opposite side of the-linc it 90 an electromagneticpole-changing device for thcjcall-current is necessary only to shift the generator-terminals from one side oi the line to the other, wlnch may be accomplished as previously described, in addition to the reversal in'thc direction oi the current through the agency of the pole changmg device, This can be done by the manipulation of thekey 11,

key member u of the switch It is arranged to connect the conductor 17 withtho conductors 19 and 23, thus completing the two local circuits through the relay-coils and if, as previously traced.

are attracted prior to the insertion of the plug in the jack and maintained in such attractedposition after the insertion of the plug. it is deemed unnecessary to trace the signaling-circuit in this case, it being stillicient to note that the negative cnrrent starting from the brush of the generator cl" passes through the line conductor S and the signal 2 at station 506 to earth, reaching the said line conductor by the short jack-spring (Hum nal being connected, through the circuit controlledby the armature g and the armatures It and It", with the said brush c, the return,- circuit from substation 506 being through the earth to the central-station ground connection l to the generator-brush c As shown in Fig. 3, a four-party line may also be provided with multiple jacks like those shown in connection with the twoparty line, in which case the shifting of the terminals of the generator from one line to the other is provided for by the arrangementof thc jack-springs, there being 'a jack for each substation. substations 50.3 and 504, at which the signals are branched from opposite sides of the lino, arc controlled by the spring-racks 503 and 504*, tho tip-terminal ol' spring-jack 503 being connected to the line 5, while the tip-terminal of spring-jack 504 is connected to the line 'l. The signals at the said substations respond to current llowing in the same direction, so that cit her station may be selectively signaled by the insertion of the plug in the proper jack, as is the. casc with the signals previously described in connectnnt with the two-party line. 'lhc jacks which control the stations 503i and 506 are snnilarly and correspondingly at anged, and since the signals at the said stations are arranged to respond to current tlownig in the opposite d1- rcction it is necessary only after the plug has In this case the armatitres/ and It and the armatures and q" and the plug-tiptcrtninalt), this termi lamp is again extingt As shown in Fig. 3, thebeen inserted in the proper jack to change .the direction of-tiow of current through the.

with. In this case the key t is used in signaling two of the stations on a founparty line, the signaling of the other two stations being automatic.

f of the relayf. Upon the energi zation of the relay 1! in response to the insertion of the plug A in the proper jack at stat-ion M cur rent. flows through the lamp H from the bat tery B through conductor 27, armature. f,

conductor 28, armature d and conductor 1, the lamp thus lighting. Upon the insert 5 of the. plug C at station N this circa. broken by tho attraction of .thc armatnt thus extinguishing the lamp, but cl circuit through conductor 2%, the: cn'c oi which, however, at this time is broken onac count'of the previous attraction of tho arm at-ure (P. The release of the arnni turn it", however, in response to the removal of the plug A at station M closes this circuit, and tho lamp H lights, thus intorn'iing 'thc operator at station N that tho line. has been disconnected. On the'roinoval oi" the plug C the "nag to the rc lease of the armaturej' his to be t'tnderstood, oi arse, that. the drawings are a conventional iilnstrationot the system, the relays being shown, whore tho control oftwo or more circuits isinvolvcd, as provided with two'or more arntaturcs. practice each rclaymay he, and usually is, provided with a single armature adapted to actuate such. contacts as may bc necessary for the control of the scvcralcircuits.

In order to avoid any possibility of misunderstandin it may be stated that the. lowermost. jack it of each setof jacks shown in the drawings is the answering-jack for the line to which it belongs, the operation ofnsaid a.n- 'sWc-ring-jacks not being referred to since no novelty is involved, the jacks being shown simply to com lets the illustration of the systern in cnera The signaling-cnrrent-gencrating evice is also conventionally shown, tho description being facilitated by indicating separate generators for positive. and negative currents.- This duplication of genera.- tors is obviously not'ossential, and it is to bc understood thatotlicr means for producing currents flowing in opposite directions might be equally well employed.

What we claim isv I 1. In a tele' hone-exchange. system provided with a p ug and jackto close a circuit" for current from a signaling-current generator, and with relays controlled respectively by the operators at the calling and called central stations to actuate circuit-closers in said circuit; an electromagnetic pole-changing switch in said circuit; and a manually-operated device for causing the operation of said pole-changing switch.

. branched the central station switch. i 3. In a telephone system, a'line-leading to circuit; a enerator for signaling-currents;'a ,jack fort e line; a plug cooperating with 2. In a telephone system, a line leading to a pluralit of substations having I signals om opposite sides of the line to a separate return-conductor, such as a groundcircuit; a enerator for signaling-currents; a jack for t lie line; a lug to be associated with said jack; an. e ectromagnetic switch lier reversing the connections between the tji'minals of said generator and the line-terinals of said jack; and means located at for pontrolling said H a plurality of substations having signals branched from opposite side's'of theline to a separate return-conductor, such as a groundsaid jack; a switch for-connecting either ter-" minal of said generator with either ofthe lineterminals of said jack andthe opposite terminal of the generator to said se arate conmental windin ductor; a relay to control sai switch; a

local circuit forenergizing said relay and means for closing said circuit; and a suppleon'said relay supplied with current throng the local-sleeve and framecircuit of the plug and jack, substantially as described. a

4. In a telephone system in which four.

substations are located'on a sin le line, two 'ofsai'd substations havin signa s branched to ground from one side 0 ,the line, and two having signals branched to ground on the oposite side of the line, the two signals 'brano hed to each side of the line being responsive to currents flowing in opposite directions a single jack for said line; a plug to be associated said line; a generator for signaling-currents; an electromagnetic polechanging switch for, reversing the direction of current from said generator, the eneratorcircuit being com letedf through t e ground and one side of t e line when the lug is in the jack; 3. manually-controlled ocal. circuit for supplying said pole-changing switch 7 plied with current through the sleeve and frame circuit for maintaining said switch after it has been operated; a; reversingswitch for reversing the connection between the terminals of the generator and the ring and tip members of the plug; a relay to 0})- erate said reversing-switch; a local circuit for sup lying said switch with. current; a manualy-operated device for controlling said circuit; and a supplemental winding supplied with current through the sleeve and frame-circuit for maintaining said switch afterit has been operated, substantially as described.

5. In a telephone system for selectively signaling the substations on a four-party line of the kind described, a jack and'plug controlling the connections with said line; agenerator for signaling-currents; a polekahanging switch; a switch for reversing the circuit connections of said generator s'e arate local circuits controlling said switc es respec-' tively; a circuit-controllerfor each of said local circuits; and a third circuit-controller common to both of said local circuits, substantially as described. 4

6. In a telephone system for selectively signaling the substations on a four-party line, a generator for signaling-currents; an electromagnetic pole-changing device; akey for operating and controllingthe movement of said device; and {an electromagnetic switch for reversing the circuit connections of said generator with the line conductors.

7. In a selective signaling system for fourparty lines terminating at a called centralstation; a source of signaling current; a pole-changing device therefor under the con.-

trol of. the operator at said called central i station; a circuit/for said current controlled at one point by said pole-changin device;- a se arate GiIClllfECOTllZI'OllGI for said circuit; a re ay to operate said circuit controller; and

roo

means located at a calling central station-for controlling the flow of relay. I

In testimony whereof we have signed our names to this specification, in the presenceof two subscribing witnesses, this 28th day of June, 1905.

JAMES (l. WRAY. HERBERT T. GARDNER. WILLIAM G. KINTON. Witnesses:

MARION A'. REEVE, "'GnoReE'E. CHIPMAN.

current through said I 

